题目

I was walking down a dimly(昏暗)lit street late one evening when I heard______coming from behind bushes.______ I slowed down to listen and panicked when I realized that what I was hearing were the sounds of a struggle.Only yards from where I stood, a woman was being attacked.Should I get______?I was frightened for my own safety, and I hated______for having suddenly decided to take a(n)______route home that night.What if I'm hurt too? Shouldn't I just run to the nearest phone and call the police?” Although it felt like a century, my thought process had only______seconds.But already the crie经测定甲醇和环己烷组成混合物中，氧的质量分数为8％，则此混合物中氢的质量分数为 [     ]A．78％ B．28％ C．14％ D．13％